Is it time for me to let go of the bitterness, or does he still warrant my bad opinion?

My dad was a horrible parent. He ignored us, hit us, emotionally abused us, and took off when I was 17, not to be heard from for 5 years. He abandoned my mom, who has MS, and left his children without a provider. That was almost 15 years ago.

For the last 10 years or so he has been taking care of my invilid mother. He bathes her, dressers her, changes her soiled linens, and is pretty much her only companion. My niece turned 16 yesterday and he got her a laptop. Know what I got for my 16th birthday? Fucken nothing.

Is it time to let it go? I have never received an apology for all the pain and trauma he caused me. In fact, I’m willing to bet that he believes he never wronged my sister, myself, or my mother.

Opinions? Suggestions on how I should/could move on?